TURBOCHARGER GP 3539905 - Caterpillar

System Operation Description:The Analog Sensor Supply provides power to all analog sensors. The primary ECM supplies 5.0 0.2 VDC from the primary ECM connector J1/P1 to each analog sensor connector. The sensor return line connects to the primary ECM connector J1/P1. The analog sensor supply is output short circuit protected. A short circuit to the battery will not damage the circuit inside the primary ECM.Note: The analog sensors are not protected from overvoltage. Directly connecting the analog sensor to battery voltage can result in damage. If the CID-FMI 262-03 is logged, it is possible that all of the analog sensors have been damaged.The following list contains a description of the analog sensors that are found on the engine.Aftercooler Temperature Sensor - The primary ECM uses the signal from the sensor to monitor changes in system temperature. The primary ECM makes adjustments to the system's operating parameters as the temperature changes. This allows the engine to operate at optimal performance through a wide range of operating temperatures. The operating range of the sensor is -40 °C to 120 °C (-40 °F to 248 °F).Coolant Temperature Sensor - Cold Mode operation improves the engine starting ability. Cold Mode operation helps to control white smoke during cold starts. Cold Mode operation helps to improve warm up time of the engine. In Normal Mode, injection timing is varied as a function of engine speed and of load. The process of combustion is improved by controlling the injection timing in Cold Mode. Transient engine response is slower in Cold Mode operation. Cold Mode operation is activated when the engine water temperature is below 60 °C (140 °F). Cold Mode operation will remain active until water temperature rises above 63 °C (145 °F). The engine will alternate between Cold Mode and Normal Mode during operation, as engine temperature fluctuates. The operating range of the sensor is -40 °C to 120 °C (-40 °F to 248 °F).Filtered Fuel Pressure Sensor - The sensor is used in conjunction with the Unfiltered Fuel Pressure sensor to determine the restriction across the fuel filters. The sensor output is